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ID: 1420685 • Letter: #
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× Chegg.com / × Take Test: Quiz #12 (Lectu X Quizzes-Spring 2016 P x Search results-zl 724550 x MyNIU oma M https://webcourses. nlu.edu/webapps/assessment take/launchisp?course-assessment_id--1 04107-1&course;_id--254746-1&content;_id--4221059-1&step;=null :) - Timed Test This test has a time limit of 1 hour. This test will save and submit automatically when the time expires Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain Not allowed. This test can only be taken once Multiple Attempts Remaining Time: 59 minutes, 52 seconds Question Completion Status: Moving to another question will save this response Question 1 of 5 Question 1 5 points Save Answer A 60.0-kg person rides in elevator while standing on a scale. The elevator has an acceleration 2.00 ms uward. What is the reading on the scale? zero O 589 N O 469 N O 349 N 709 N Moving to another question will save this response Question 1 of 5 02:03 ueExplanation / Answer
1) 709 N
Reading on the scale = m*g + m*a
= 60*9.81 + 60*2
= 709 N
2) 1.43*10^3 N south
Use Work-energy theorem,
W = change in KE
F*d = -0.5*m*v^2
F = -0.5*m*v^2/d
= -0.5*1000*20^2/140
= -1.43*10^3 N
-sign indicates oppoiste to motion.
3) 8.00 N
a = F/(m1+m2)
= 20/(6+4)
= 2 m/s^2
force on second block, F2 = m2*a
= 4*2
= 8 N
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